Accumulated Other Comprehensive Loss - Changes in AOCI (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	$ 1,798.9
Other comprehensive income (loss) before reclassifications	7.1
Amounts reclassified from accumulated other comprehensive loss	1.2
Current period other comprehensive income (loss)	8.3
Reclassification of stranded tax effects	(30.0)
Ending equity	1,826.9
Cash flow hedge (loss) gain
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	0.8
Other comprehensive income (loss) before reclassifications	(0.3)
Amounts reclassified from accumulated other comprehensive loss	(0.3)
Current period other comprehensive income (loss)	(0.6)
Reclassification of stranded tax effects	0.0
Ending equity	0.2
Unrealized gain (loss) on available-for- sale securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	(2.0)
Other comprehensive income (loss) before reclassifications	0.3
Amounts reclassified from accumulated other comprehensive loss	0.0
Current period other comprehensive income (loss)	0.3
Reclassification of stranded tax effects	0.0
Ending equity	(1.7)
Pension and post retirement benefit plan adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	(158.7)
Other comprehensive income (loss) before reclassifications	0.0
Amounts reclassified from accumulated other comprehensive loss	1.5
Current period other comprehensive income (loss)	1.5
Reclassification of stranded tax effects	(30.0)
Ending equity	(187.2)
Cumulative translation adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	(125.8)
Other comprehensive income (loss) before reclassifications	7.1
Amounts reclassified from accumulated other comprehensive loss	0.0
Current period other comprehensive income (loss)	7.1
Reclassification of stranded tax effects	0.0
Ending equity	(118.7)
AOCI Including Portion Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning equity	(285.7)
Ending equity	$ (307.4)

Tax Cuts And Jobs Act Of 2017 Reclassification From Aoci To Retained Earnings Tax Effect

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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