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Derivative Financial Instruments and Fair Value Measurements (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 EUR (€)	Dec. 31, 2014 USD ($)
Net investment hedges [Abstract]
Translation loss on net investment hedge	$ 4.2		$ 4.2			$ 24.5
Recurring basis
Assets
Deferred compensation plan assets	80.9		80.9			81.4
Foreign currency forward contracts	0.1		0.1			0.1
Total assets	81.0		81.0			81.5
Liabilities
Foreign currency forward contracts	0.7		0.7
Total liabilities	0.7		0.7
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Deferred compensation plan assets	80.9		80.9			81.4
Foreign currency forward contracts	0.0		0.0			0.0
Total assets	80.9		80.9			81.4
Liabilities
Foreign currency forward contracts	0.0		0.0
Total liabilities	0.0		0.0
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Deferred compensation plan assets	0.0		0.0			0.0
Foreign currency forward contracts	0.1		0.1			0.1
Total assets	0.1		0.1			0.1
Liabilities
Foreign currency forward contracts	0.7		0.7
Total liabilities	0.7		0.7
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
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
Foreign currency forward contracts	0.0		0.0
Total liabilities	0.0		0.0
Euro-denominated notes
Net investment hedges [Abstract]
Translation loss on net investment hedge	0.0		0.0			24.5
Forward contracts | Designated as hedging instrument
Net investment hedges [Abstract]
Translation loss on net investment hedge	4.2		4.2
Forward contracts | Not designated as hedging instrument
Net investment hedges [Abstract]
Loss associated with forward contracts included in interest and other expenses	0.9	$ 0.1
Gain associated with forward contracts included in interest and other expenses			0.9	$ 0.1
Fair value | Euro-denominated notes | Significant Other Observable Inputs (Level 2)
Liabilities
Carrying value of long-term debt	876.7		876.7			471.6
Carrying value | Euro-denominated notes
Liabilities
Carrying value of long-term debt	833.6		833.6			$ 422.1
Notes due June 2018 | Euro-denominated notes | Designated as hedging instrument
Net investment hedges [Abstract]
Long-term debt	390.1		390.1		€ 350,000,000.0
Notes due September 2022 | Euro-denominated notes | Designated as hedging instrument
Net investment hedges [Abstract]
Long-term debt	$ 443.5		$ 443.5		€ 400,000,000

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