Income Taxes - Unrecognized Tax Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Unrecognized tax benefits that would impact effective tax rate		$ 23.4
Reconciliation of the total gross unrecognized tax benefits
Balance, January 1	25.8	26.2	27.6
Additions based on tax positions related to current year		2.0	0.5
Additions for tax positions of prior years		13.4	3.9
Reductions for closure of tax audits and settlements		(14.6)	(4.3)
Reductions for lapse in statute of limitations		(1.7)	(0.8)
Increases resulting from foreign currency translation		0.5
Decreases resulting from foreign currency translation			(0.7)
Balance, December 31		25.8	26.2
Income tax penalties and interest expense		0.5	1.7
Income tax penalties and interest accrued on unrecognized tax benefits		8.3	7.8
Estimated tax payment year 1	$ 18.5