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v3.21.1

Shareholder's Equity - Change in Shareholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | $ 1,854.5 | $ 1,573.2 |
Accounting Standards Update [Extensible List] |  |  | us-gaap:AccountingStandardsUpdate201613Member
Net income | 151.2 | 74.3 |
Activity related to stock-based compensation | $ 2.5 | 12.8 |
Share purchased under share repurchase program (in shares) | 479,000 |  |
Shares purchased under share repurchase program | $ (137.1) | (115.5) |
Dividends declared | (12.5) | (11.8) |
Other comprehensive loss, net of tax | (29.6) | (42.7) |
Balance, end of period | $ 1,829.0 | 1,490.2 | $ 1,573.2
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period |  | $ (0.1) |
Balance, end of period |  |  | $ (0.1)
Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance (in shares) | 75,300,000 | 75,300,000 |
Balance, beginning of period | $ 18.8 | $ 18.8 |
Balance (in shares) | 75,300,000 | 75,300,000 | 75,300,000
Balance, end of period | $ 18.8 | $ 18.8 | $ 18.8
Capital in Excess of Par Value |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | 267.3 | 272.7 |
Activity related to stock-based compensation | (20.6) | (5.1) |
Balance, end of period | $ 246.7 | $ 267.6 | $ 272.7
Treasury Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance (in shares) | 1,300,000 | 1,200,000 |
Balance, beginning of period | $ (167.7) | $ (118.1) |
Activity related to stock -based compensation (in shares) | (300,000) | (300,000) |
Activity related to stock-based compensation | $ 23.1 | $ 17.9 |
Share purchased under share repurchase program (in shares) | 500,000 | 800,000 |
Shares purchased under share repurchase program | $ (137.1) | $ (115.5) |
Balance (in shares) | 1,500,000 | 1,700,000 | 1,200,000
Balance, end of period | $ (281.7) | $ (215.7) | $ (118.1)
Retained earnings |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | 1,846.7 | 1,549.4 |
Net income | 151.2 | 74.3 |
Dividends declared | (12.5) | (11.8) |
Balance, end of period | 1,985.4 | 1,611.8 | 1,549.4
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period |  | (0.1) |
Balance, end of period |  |  | (0.1)
Accumulated other comprehensive loss |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | (110.6) | (149.6) |
Other comprehensive loss, net of tax | (29.6) | (42.7) |
Balance, end of period | $ (140.2) | $ (192.3) | $ (149.6)

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