Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,407,800,000	$ 1,246,600,000
Cumulative effect of an accounting change			$ 12,200,000
Ending balance	1,346,100,000	1,434,300,000
Unrealized Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(208,800,000)	(292,200,000)
Cumulative effect of an accounting change			0
Adjusted balance			(208,800,000)
Current year deferrals to AOCI	(83,800,000)	88,300,000
Reclassifications from AOCI to Net income (loss)	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(83,800,000)	88,300,000
Ending balance	(292,600,000)	(203,900,000)
Pension Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(31,400,000)	(56,600,000)
Cumulative effect of an accounting change			0
Adjusted balance			(31,400,000)
Current year deferrals to AOCI	(1,500,000)	(300,000)
Reclassifications from AOCI to Net income (loss)	700,000	6,200,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(800,000)	5,900,000
Ending balance	(32,200,000)	(50,700,000)
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	800,000	400,000
Cumulative effect of an accounting change			(800,000)
Adjusted balance			0
Current year deferrals to AOCI	0	(100,000)
Reclassifications from AOCI to Net income (loss)	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0	(100,000)
Ending balance	0	300,000
Unrealized Gain (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,600,000)	(2,000,000)
Cumulative effect of an accounting change			0
Adjusted balance			(1,600,000)
Current year deferrals to AOCI	14,400,000	1,700,000
Reclassifications from AOCI to Net income (loss)	(400,000)	(1,700,000)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	14,000,000	0
Ending balance	12,400,000	(2,000,000)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(241,000,000)	(350,400,000)
Cumulative effect of an accounting change			(800,000)
Adjusted balance			$ (241,800,000)
Current year deferrals to AOCI	(70,900,000)	89,600,000
Reclassifications from AOCI to Net income (loss)	300,000	4,500,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(70,600,000)	94,100,000
Ending balance	$ (312,400,000)	$ (256,300,000)