Derivative Financial Instruments and Fair Value Measurements (Details) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2012 Recurring Basis [Member] USD ($)	Dec. 31, 2011 Recurring Basis [Member] USD ($)	Jun. 30, 2012 Recurring Basis [Member] Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] USD ($)	Dec. 31, 2011 Recurring Basis [Member] Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] USD ($)	Jun. 30, 2012 Recurring Basis [Member] Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] USD ($)	Dec. 31, 2011 Recurring Basis [Member] Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] USD ($)	Jun. 30, 2012 Recurring Basis [Member] Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member] USD ($)	Dec. 31, 2011 Recurring Basis [Member] Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member] USD ($)	Jun. 30, 2012 Carrying Amount [Member] USD ($)	Dec. 31, 2011 Carrying Amount [Member] USD ($)	Jun. 30, 2012 Carrying Amount [Member] Euro-denominated Note EUR350 [Member] USD ($)	Jun. 30, 2012 Carrying Amount [Member] Euro-denominated Note EUR350 [Member] EUR (€)	Jun. 30, 2012 Carrying Amount [Member] Euro-denominated Note EUR200 [Member] USD ($)	Jun. 30, 2012 Carrying Amount [Member] Euro-denominated Note EUR200 [Member] EUR (€)	Jun. 30, 2012 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Euro-denominated Notes Total [Member] USD ($)	Dec. 31, 2011 Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Euro-denominated Notes Total [Member] USD ($)
Net investment hedges [Abstract]
Long-term Debt														$ 696.3	$ 647.6	$ 443.2	€ 350.0	$ 253.1	€ 200.0	$ 713.1	$ 654.9
Gain/(Loss) from economic hedges included in Accumulated Other Comprehensive Income, net of taxes	(33.8)		(33.8)		(43.2)
Gain (loss) associated with forward contracts included in Interest and Other Expenses	(0.3)	0	0.4	0
Assets [Abstract]
Available-for-sale securities						0.4	0.4	0.4	0.4	0	0	0	0
Deferred compensation plan assets						52.5	45.2	52.5	45.2	0	0	0	0
Total assets						52.9	45.6	52.9	45.6	0	0	0	0
Liabilities [Abstract]
Foreign currency forward contracts						0.2	0.3	0	0	0.2	0.3	0	0
Total Liabilities						$ 0.2	$ 0.3	$ 0	$ 0	$ 0.2	$ 0.3	$ 0	$ 0