Income Taxes - Uncertain Tax Positions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Uncertain Tax Positions [Roll Forward]
Beginning of year	$ 11.8	$ 17.2	$ 19.4
Increases related to prior-year tax positions	0.1	1.4	0.8
Decreases related to prior-year tax positions	0	(6.9)	(1.6)
Increases related to current-year tax positions	2.3	1.6	1.3
Settlements	(0.7)	(0.7)	0
Effect of the expiration of statutes of limitation	(3.4)	(1.2)	(1.2)
Increases (decreases) related to business combinations and dispositions	0	0	(0.7)
Foreign exchange differences and reclassification	0.7	0.4	(0.8)
End of year	$ 10.8	$ 11.8	$ 17.2