Stockholders' Equity (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income (loss) before reclassifications, net of tax				$ (235.1)
Reclassification adjustment for net losses (gains) included in net income, net of tax				61.8
Other comprehensive income (loss), net of tax		$ (125.6)	$ (96.4)	(173.3)	$ (89.4)
Accumulated other comprehensive income (loss), net of tax		(857.0)		(857.0)		$ (683.7)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income (loss) before reclassifications, net of tax				(184.6)
Other comprehensive income (loss), net of tax	[1]			(184.6)
Accumulated other comprehensive income (loss), net of tax		(496.5)		(496.5)		(311.9)
Hedging
Accumulated Other Comprehensive Income (Loss)
Other comprehensive income (loss) before reclassifications, net of tax				(50.5)
Reclassification adjustment for net losses (gains) included in net income, net of tax				44.6
Other comprehensive income (loss), net of tax	[2]			(5.9)
Accumulated other comprehensive income (loss), net of tax		(83.2)		(83.2)		(77.3)
Defined Pension and Other Post-retirement Benefits
Accumulated Other Comprehensive Income (Loss)
Reclassification adjustment for net losses (gains) included in net income, net of tax				17.2
Other comprehensive income (loss), net of tax	[3]			17.2
Accumulated other comprehensive income (loss), net of tax		$ (277.3)		$ (277.3)		$ (294.5)

[1] Net of income tax (expense) benefit of nil and $5.5 for the three months ended September 30, 2015 and 2014, respectively, and $6.8 and $4.3 for the nine months ended September 30, 2015 and 2014, respectively.

[2] Net of income tax (expense) benefit of $5.5 and $9.9 for the three months ended September 30, 2015 and 2014, respectively, and $1.9 and $9.0 for the nine months ended September 30, 2015 and 2014, respectively.

[3] Net of income tax (expense) benefit of $(3.1) and $(1.4) for the three months ended September 30, 2015 and 2014, respectively, and $(8.1) and $(4.8) for the nine months ended September 30, 2015 and 2014, respectively.