Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of the components of accumulated other comprehensive income, net of tax
Balance at beginning of period	$ 182.4	$ 137.8	$ 142.5
Other comprehensive income (loss)	(154.3)	42.3	(7.1)
Realized loss on reclassification	0.1	2.3	2.4
Balance at end of period	28.2	182.4	137.8
Foreign Currency Translation
Summary of the components of accumulated other comprehensive income, net of tax
Balance at beginning of period	197.6	170.3	161.1
Other comprehensive income (loss)	(131.6)	27.3	9.2
Balance at end of period	66.0	197.6	170.3
Unrealized Losses on Derivatives
Summary of the components of accumulated other comprehensive income, net of tax
Balance at beginning of period			(1.1)
Other comprehensive income (loss)			(0.2)
Realized loss on reclassification			1.3
Pension Liability Adjustment
Summary of the components of accumulated other comprehensive income, net of tax
Balance at beginning of period	(15.2)	(32.5)	(17.5)
Other comprehensive income (loss)	(22.7)	15.0	(16.1)
Realized loss on reclassification	0.1	2.3	1.1
Balance at end of period	$ (37.8)	$ (15.2)	$ (32.5)