Other Comprehensive (Loss) Income - Changes in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (334.6)
Other Comprehensive (Loss) Income before Reclassifications	(29.9)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	18.8
Net Current-period Other Comprehensive (Loss) Income	(11.1)	$ (146.4)	$ 123.1
Ending balance	(345.7)	(334.6)
Derivatives Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(17.7)
Other Comprehensive (Loss) Income before Reclassifications	(7.9)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	7.2
Net Current-period Other Comprehensive (Loss) Income	(0.7)
Ending balance	(18.4)	(17.7)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(50.6)
Other Comprehensive (Loss) Income before Reclassifications	(37.2)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0.0
Net Current-period Other Comprehensive (Loss) Income	(37.2)
Ending balance	(87.8)	(50.6)
Pension and Postretirement Benefit Plans | Pension Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(280.2)
Other Comprehensive (Loss) Income before Reclassifications	12.0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	12.8
Net Current-period Other Comprehensive (Loss) Income	24.8
Ending balance	(255.4)	(280.2)
Pension and Postretirement Benefit Plans | Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	13.9
Other Comprehensive (Loss) Income before Reclassifications	3.2
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1.2)
Net Current-period Other Comprehensive (Loss) Income	2.0
Ending balance	$ 15.9	$ 13.9