Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common Stock Issued | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive (Loss) Income |
Beginning balance at Dec. 31, 2017 | $ 555.2 | $ 0.5 | $ 276.8 | $ (75.1) | $ 355.1 | $ (2.1) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Common stock issued, net of shares withheld for employee taxes | | | (1.8) | | | |
Stock-based compensation expense | | | 6.4 | | | |
Repurchase of common stock | | | | (12.5) | | |
Net income | 33.4 | | | | 33.4 | |
Dividends declared | | | | | (14) | |
Other comprehensive (loss) gain | (1.9) | | | | | (1.9) |
Ending balance at Sep. 30, 2018 | $ 564.8 | $ 0.5 | 281.4 | $ (87.6) | 374.5 | (4) |
Beginning balance (in shares) at Dec. 31, 2017 | | 52.4 | | 6.2 | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Issuance of stock based instruments, net of shares withheld for employee taxes (in shares) | | 0.1 | | | | |
Repurchase of common stock (in shares) | | | | (0.5) | | |
Ending balance (in shares) at Sep. 30, 2018 | 45.8 | 52.5 | | 6.7 | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Dividends declared (in dollars per share) | $ 0.30 | | | | | |
Beginning balance at Jun. 30, 2018 | $ 547.9 | $ 0.5 | 279.6 | $ (82.6) | 355.6 | (5.2) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Common stock issued, net of shares withheld for employee taxes | | | (0.2) | | | |
Stock-based compensation expense | | | 2 | | | |
Repurchase of common stock | | | | (5) | | |
Net income | 23.7 | | | | 23.7 | |
Dividends declared | | | | | (4.8) | |
Other comprehensive (loss) gain | 1.2 | | | | | 1.2 |
Ending balance at Sep. 30, 2018 | $ 564.8 | $ 0.5 | 281.4 | $ (87.6) | 374.5 | (4) |
Beginning balance (in shares) at Jun. 30, 2018 | | 52.5 | | 6.5 | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Issuance of stock based instruments, net of shares withheld for employee taxes (in shares) | | 0 | | | | |
Repurchase of common stock (in shares) | | | | (0.2) | | |
Ending balance (in shares) at Sep. 30, 2018 | 45.8 | 52.5 | | 6.7 | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Dividends declared (in dollars per share) | $ 0.10 | | | | | |
Beginning balance at Dec. 31, 2018 | $ 567 | $ 0.5 | 283.3 | $ (90.6) | 381.6 | (7.8) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Common stock issued, net of shares withheld for employee taxes | | | (2.2) | | | |
Stock-based compensation expense | | | 7.2 | | | |
Repurchase of common stock | | | | (8.1) | | |
Net income | 41.5 | | | | 41.5 | |
Dividends declared | | | | | (15.3) | |
Other comprehensive (loss) gain | 1.5 | | | | | 1.5 |
Ending balance at Sep. 30, 2019 | $ 591.6 | | 288.3 | $ (98.7) | 407.8 | (6.3) |
Beginning balance (in shares) at Dec. 31, 2018 | | 52.5 | | 6.8 | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Issuance of stock based instruments, net of shares withheld for employee taxes (in shares) | | 0.2 | | | | |
Repurchase of common stock (in shares) | | | | (0.3) | | |
Ending balance (in shares) at Sep. 30, 2019 | 45.6 | 52.7 | | 7.1 | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Dividends declared (in dollars per share) | $ 0.33 | | | | | |
Beginning balance at Jun. 30, 2019 | $ 580.8 | $ 0.5 | 285.3 | $ (90.6) | 390.4 | (4.8) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Common stock issued, net of shares withheld for employee taxes | | | (0.1) | | | |
Stock-based compensation expense | | | 3.1 | | | |
Repurchase of common stock | | | | (8.1) | | |
Net income | 22.5 | | | | 22.5 | |
Dividends declared | | | | | (5.1) | |
Other comprehensive (loss) gain | (1.5) | | | | | (1.5) |
Ending balance at Sep. 30, 2019 | $ 591.6 | | $ 288.3 | $ (98.7) | $ 407.8 | $ (6.3) |
Beginning balance (in shares) at Jun. 30, 2019 | | 52.7 | | 6.8 | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Issuance of stock based instruments, net of shares withheld for employee taxes (in shares) | | 0 | | | | |
Repurchase of common stock (in shares) | | | | (0.3) | | |
Ending balance (in shares) at Sep. 30, 2019 | 45.6 | 52.7 | | 7.1 | | |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | | |
Dividends declared (in dollars per share) | $ 0.11 | | | | | |