Income Tax Expense - Valuation Allowance (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Valuation allowance
Valuation allowance	$ 178.7	$ 241.2
Net increase (decrease) in U.S. and foreign valuation allowances	(62.5)	4.9
Estimated cumulative amount of earnings from foreign subsidiaries that are permanently reinvested	260.7
Foreign
Valuation allowance
Valuation allowance	126.7	195.6
Deferred tax assets | U.S. Federal
Valuation allowance
Valuation allowance	74.7	144.3
Deferred tax assets | State
Valuation allowance
Valuation allowance	33.8	33.1
Tax credit carryforward | Foreign
Valuation allowance
Valuation allowance	18.2	18.2
Net operating loss (NOL) carry forwards | Foreign
Valuation allowance
Valuation allowance	$ 51.9	$ 45.6