Shareholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	$ (44.2)	$ 28.2	$ 182.4
Other comprehensive income (loss)	(35.7)	(86.4)	(154.3)
Realized loss on reclassification	4.0	14.0	0.1
Balance at end of period	(75.9)	(44.2)	28.2
Foreign Currency Translation
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	3.2	66.0	197.6
Other comprehensive income (loss)	(27.3)	(62.8)	(131.6)
Balance at end of period	(24.1)	3.2	66.0
Pension Liability Adjustment
Summary of the components of accumulated other comprehensive income (loss), net of tax
Balance at beginning of period	(47.4)	(37.8)	(15.2)
Other comprehensive income (loss)	(8.4)	(23.6)	(22.7)
Realized loss on reclassification	4.0	14.0	0.1
Balance at end of period	$ (51.8)	$ (47.4)	$ (37.8)