Changes in Stockholders' Equity (Changes in Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, December 31, 2014	$ (906.5)
Other comprehensive loss before reclassifications	(346.1)
Net losses reclassified from accumulated other comprehensive loss	2.5
Other comprehensive income (loss), net of reclassification adjustments	(343.6)
Accumulated other comprehensive loss, March 31, 2015	(1,250.1)
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, December 31, 2014	(253.3)
Other comprehensive loss before reclassifications	0
Net losses reclassified from accumulated other comprehensive loss	2.2
Other comprehensive income (loss), net of reclassification adjustments	2.2
Accumulated other comprehensive loss, March 31, 2015	(251.1)
Deferred Net (Losses) Gains on Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, December 31, 2014	(0.1)
Other comprehensive loss before reclassifications	(1.9)
Net losses reclassified from accumulated other comprehensive loss	0.3
Other comprehensive income (loss), net of reclassification adjustments	(1.6)
Accumulated other comprehensive loss, March 31, 2015	(1.7)
Cumulative Translatoin Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive loss, December 31, 2014	(653.1)
Other comprehensive loss before reclassifications	(344.2)
Net losses reclassified from accumulated other comprehensive loss	0
Other comprehensive income (loss), net of reclassification adjustments	(344.2)
Accumulated other comprehensive loss, March 31, 2015	$ (997.3)