Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
January 1, 2014	$ (191.6)	$ (129.5)
Other comprehensive income (loss) before reclassifications	(232.6)	(95.6)
Amounts reclassified from accumulated other comprehensive income (loss)	4.1	4.5
Other comprehensive income (loss)	(228.5)	(91.1)
September 30, 2014	(420.1)	(220.6)
Unrealized Gain (Loss) on Available-for-Sale Securities
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
January 1, 2014	(1.6)	(2.0)
Other comprehensive income (loss) before reclassifications	0.3	0.3
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	0.3	0.3
September 30, 2014	(1.3)	(1.7)
Defined Benefit Pension and Postemployment Plans
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
January 1, 2014	(68.8)	(89.8)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	4.1	4.5
Other comprehensive income (loss)	4.1	4.5
September 30, 2014	(64.7)	(85.3)
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	4.8	4.2
Actuarial (gains) losses	2.0	3.4
Periodic benefit cost (see Note 9)	6.8	7.6
Income taxes	2.7	3.1
Periodic benefit cost, net of income taxes	4.1	4.5
Foreign Currency Translation
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
January 1, 2014	(121.2)	(37.7)
Other comprehensive income (loss) before reclassifications	(232.9)	(95.9)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	(232.9)	(95.9)
September 30, 2014	$ (354.1)	$ (133.6)