Accumulated Other Comprehensive Loss, Net of Tax (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Foreign Currency Translation Adjustment:
Balance at beginning of period			$ (243.7)	$ (130.1)
Other comprehensive (loss) income before reclassifications			25.4	(110.3)
Amount reclassified from accumulated other comprehensive loss, net of tax			(0.9)	0
Balance at end of period	(219.2)	(240.4)	(219.2)	(240.4)
Available-for-sale Securities:
Balance at beginning of period			0.4	0.8
Other comprehensive (loss) income before reclassifications			0.2	0.8
Amount reclassified from accumulated other comprehensive loss, net of tax			0	(1.2)
Balance at end of period	0.6	0.4	0.6	0.4
Derivative instruments:
Balance at beginning of period			(11.7)	(12.7)
Other comprehensive (loss) income before reclassifications	0	0	(0.6)	0
Amount reclassified from accumulated other comprehensive loss, net of tax			0.8	0.5
Balance at end of period	(11.5)	(12.2)	(11.5)	(12.2)
Defined benefit pension and other postretirement plans:
Balance at beginning of period			(156.2)	(146.0)
Other comprehensive (loss) income before reclassifications			(0.5)	(0.7)
Amount reclassified from accumulated other comprehensive loss,net of tax			3.7	3.5
Balance at end of period	(153.0)	(143.2)	(153.0)	(143.2)
Total Changes in Accumulated Other Comprehensive Loss, Net of Tax [Abstract]
Balance at beginning of period			(411.2)	(288.0)
Other comprehensive (loss) income before reclassifications			24.5	(110.2)
Amount reclassified from accumulated other comprehensive loss, net of tax	2.0	1.4	3.6	2.8
Balance at end of period	$ (383.1)	$ (395.4)	$ (383.1)	$ (395.4)