Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
January 1	$ (618,200,000)	$ (191,600,000)
Other comprehensive income (loss) before reclassifications	(320,700,000)	20,500,000
Amounts reclassified from accumulated other comprehensive income (loss)	2,200,000	1,400,000
Other comprehensive income (loss)	(318,500,000)	21,900,000
March 31	(936,700,000)	(169,700,000)
Reclassification out of Accumulated Other Comprehensive Income [Abstract]
Cash flow hedge liability, fair value	4,200,000
Unrealized Gain (Loss) on Cash Flow Hedge
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
January 1	0
Other comprehensive income (loss) before reclassifications	(2,500,000)	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	(2,500,000)	0
March 31	(2,500,000)	0
Unrealized Gain (Loss) on Available-for-Sale Securities
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
January 1	(1,200,000)	(1,600,000)
Other comprehensive income (loss) before reclassifications	200,000	100,000
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	200,000	100,000
March 31	(1,000,000)	(1,500,000)
Defined Benefit Pension and Postemployment Plans
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
January 1	(92,100,000)	(68,800,000)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	2,200,000	1,400,000
Other comprehensive income (loss)	2,200,000	1,400,000
March 31	(89,900,000)	(67,400,000)
Defined Benefit Pension and Postemployment Plans | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Abstract]
Prior service cost	1,900,000	1,600,000
Actuarial (gains) losses	1,800,000	700,000
Net periodic benefit cost (see Note 8)	3,700,000	2,300,000
Income taxes	1,500,000	900,000
Periodic benefit cost, net of income tax	2,200,000	1,400,000
Foreign Currency Translation
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
January 1	(524,900,000)	(121,200,000)
Other comprehensive income (loss) before reclassifications	(318,400,000)	20,400,000
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	(318,400,000)	20,400,000
March 31	(843,300,000)	(100,800,000)
Cash Flow Hedge [Member]
Reclassification out of Accumulated Other Comprehensive Income [Abstract]
Cash flow hedge, notional amount	$ 1,000,000,000
Cash flow hedge, fixed interest rate	2.3209%
Cash flow hedge, inception date	Mar. 26, 2015
Cash flow hedge, maturity date	May 02, 2016