Income Taxes - Valuation Allowances (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Movement in Valuation Allowances and Reserves [Roll Forward] | |||||||||||
Beginning of year | $ 62.8 | $ 45.7 | $ 62.8 | $ 45.7 | $ 40.1 | ||||||
Expiring tax credits | (0.4) | (0.4) | (0.3) | ||||||||
Acquisitions and dispositions | (3.4) | (0.3) | 0.0 | ||||||||
Changes in judgment about deferred tax assets(a) | (1.8) | 2.6 | 1.5 | ||||||||
Income from continuing operations | $ (52.0) | $ 19.9 | $ 14.3 | $ 34.7 | $ 14.5 | $ 24.5 | $ 0.3 | $ (3.1) | 16.9 | 36.2 | (9.1) |
Other comprehensive loss | (18.8) | (15.8) | (103.4) | ||||||||
Foreign currency exchange effects | (2.4) | (8.5) | (4.3) | ||||||||
End of year | 98.9 | 62.8 | 98.9 | 62.8 | 45.7 | ||||||
Retained earnings | 564.9 | $ 576.0 | 564.9 | 576.0 | |||||||
Valuation Allowance of Deferred Tax Assets | |||||||||||
Movement in Valuation Allowances and Reserves [Roll Forward] | |||||||||||
Income from continuing operations | 43.9 | 20.5 | 8.4 | ||||||||
Other comprehensive loss | 0.2 | 0.7 | 0.3 | ||||||||
Retained earnings | 0.0 | $ 2.5 | $ 0.0 | ||||||||
Retained earnings | $ 2.5 | $ 2.5 |