Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 1,244.9	$ 1,179.6	$ 1,149.9
Other comprehensive income (loss) before reclassifications	121.9
Amounts reclassified from accumulated other comprehensive loss	7.5
Total other comprehensive income (loss)	129.4	(50.5)	(54.2)
Balance	1,495.1	1,244.9	1,179.6
Unrecognized Net Defined
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(14.6)
Other comprehensive income (loss) before reclassifications	(2.9)
Amounts reclassified from accumulated other comprehensive loss	(1.0)
Total other comprehensive income (loss)	(3.9)
Balance	(18.5)	(14.6)
Change in Fair Value of Derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(18.7)
Other comprehensive income (loss) before reclassifications	25.0
Amounts reclassified from accumulated other comprehensive loss	8.5
Total other comprehensive income (loss)	33.5
Balance	14.8	(18.7)
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(141.1)
Other comprehensive income (loss) before reclassifications	99.8
Total other comprehensive income (loss)	99.8
Balance	(41.3)	(141.1)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(174.4)	(123.9)	(69.7)
Total other comprehensive income (loss)	129.4	(50.5)	(54.2)
Balance	$ (45.0)	$ (174.4)	$ (123.9)