Financial Instruments - Effects of Derivative Financial Instruments on Income and Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
2013 Interest Rate Swap, net of tax	[1]	$ (0.1)	$ (1.9)	$ (2.0)	$ (2.9)
2013 Interest Rate Swap, tax expense (benefit)		0.0	(1.2)	(1.2)	(1.8)
Interest Rate Swap | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
2013 Interest Rate Swap, net of tax		(0.1)	(1.9)	(2.0)	(2.9)
Interest Rate Swap | Designated as Hedging Instrument | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Loss on Derivative		(0.5)	0.0	(0.5)	0.0
Foreign exchange contracts | Not Designated as Hedging Instrument | Foreign Currency Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency gain (loss), net		$ 0.4	$ (1.2)	$ 0.9	$ (1.3)

[1] Net of tax benefit of nil and $1.2 million for the three months ended June 30, 2015 and 2014, respectively, and $1.2 million and $1.8 million for the six months ended June 30, 2015 and 2014, respectively.