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v3.19.1

Shareholders' Equity Change in Shareholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance | $ 1,396.3 | $ 1,279.9
Cumulative effect of new accounting principle in period of adoption |  | 11.4
Net income | 55.4 | 43.6
Activity related to stock-based compensation | $ 10.7 | 7.2
Share purchased under share repurchase program (in shares) | 800,000 |
Shares purchased under share repurchase program | $ (83.1) | (47.9)
Dividends declared | (10.6) | (10.4)
Other comprehensive income, net of tax | 0.8 | 21.5
Balance | 1,369.5 | 1,305.3
Common Stock [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance | $ 18.8 | $ 18.8
Balance (in shares) | 75,300,000 | 75,200,000
Shares issued under stock plans (in shares) | 0 | 100,000
Activity related to stock-based compensation | $ 0.0 | $ 0.0
Balance | $ 18.8 | $ 18.8
Balance (in shares) | 75,300,000 | 75,300,000
Additional Paid-in Capital [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance | $ 282.0 | $ 309.3
Activity related to stock-based compensation | (3.5) | (0.8)
Balance | 278.5 | 308.5
Treasury Stock [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance | $ (103.7) | $ (109.1)
Balance (in shares) | 1,200,000 | 1,300,000
Shares issued under stock plans (in shares) | (200,000) | (100,000)
Activity related to stock-based compensation | $ 14.2 | $ 8.0
Share purchased under share repurchase program (in shares) | 800,000 | 500,000
Shares purchased under share repurchase program | $ (83.1) | $ (47.9)
Balance | $ (172.6) | $ (149.0)
Balance (in shares) | 1,800,000 | 1,700,000
Retained Earnings [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance | $ 1,353.4 | $ 1,178.2
Cumulative effect of new accounting principle in period of adoption |  | 11.4
Net income | 55.4 | 43.6
Dividends declared | 10.6 | (10.4)
Balance | 1,398.2 | 1,222.8
AOCI Attributable to Parent [Member] |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Balance | (154.2) | (117.3)
Other comprehensive income, net of tax | 0.8 | 21.5
Balance | $ (153.4) | $ (95.8)

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