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Derivative Financial Instruments and Fair Value Measurements (Details) € in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 EUR (€)	Dec. 31, 2014 USD ($)
Net investment hedges [Abstract]
Translation loss on net investment hedge	$ (3.6)		$ (3.6)			$ (24.5)
Recurring Basis [Member]
Assets [Abstract]
Deferred compensation plan assets	86.6		86.6			81.4
Foreign currency forward contracts	2.0		2.0			0.1
Total assets	88.6		88.6			81.5
Liabilities [Abstract]
Foreign currency forward contracts	0.4		0.4
Total liabilities	0.4		0.4
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Deferred compensation plan assets	86.6		86.6			81.4
Foreign currency forward contracts	0.0		0.0			0.0
Total assets	86.6		86.6			81.4
Liabilities [Abstract]
Foreign currency forward contracts	0.0		0.0
Total liabilities	0.0		0.0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Deferred compensation plan assets	0.0		0.0			0.0
Foreign currency forward contracts	2.0		2.0			0.1
Total assets	2.0		2.0			0.1
Liabilities [Abstract]
Foreign currency forward contracts	0.4		0.4
Total liabilities	0.4		0.4
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Deferred compensation plan assets	0.0		0.0			0.0
Foreign currency forward contracts	0.0		0.0			0.0
Total assets	0.0		0.0			0.0
Liabilities [Abstract]
Foreign currency forward contracts	0.0		0.0
Total liabilities	0.0		0.0
Euro-denominated Note EUR350.0 [Member]
Net investment hedges [Abstract]
Long-term debt	390.1		390.1		€ 350.0
Translation loss on net investment hedge	(3.5)		(3.5)			(24.5)
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]
Net investment hedges [Abstract]
Gain (loss) associated with forward contracts included in interest and other expenses	1.6	$ 0.2	1.8	$ 0.2
Forward Contracts [Member] | Designated as Hedging Instrument [Member]
Net investment hedges [Abstract]
Translation loss on net investment hedge	(0.1)		(0.1)
Fair Value [Member] | Euro-denominated Note EUR350.0 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities [Abstract]
Notes payable	430.3		430.3			471.6
Carrying Value [Member] | Euro-denominated Note EUR350.0 [Member]
Liabilities [Abstract]
Notes payable	$ 390.1		$ 390.1			$ 423.4

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