Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Foreign Currency Translation Adjustment:
Balance at beginning of period			$ (436.3)	$ (243.7)
Other comprehensive (loss) income before reclassifications			(108.3)	25.4
Amount reclassified from accumulated other comprehensive loss, net of tax			(1.2)	(0.9)
Balance at end of period	$ (545.8)	$ (219.2)	(545.8)	(219.2)
Available For Sale Securities Abstract
Balance at beginning of period			0.8	0.4
Other comprehensive (loss) income before reclassifications			0.2	0.2
Amount reclassified from accumulated other comprehensive loss, net of tax			(0.1)	0.0
Balance at end of period	0.9	0.6	0.9	0.6
Derivative instruments:
Balance at beginning of period			(10.9)	(11.7)
Other comprehensive (loss) income before reclassifications	0.0	0.0	0.0	(0.6)
Amount reclassified from accumulated other comprehensive loss, net of tax			0.6	0.8
Balance at end of period	(10.3)	(11.5)	(10.3)	(11.5)
Unrecognized Losses Transition Obligation And Prior Service Cost Abstract
Balance at beginning of period			(190.3)	(156.2)
Other comprehensive (loss) income before reclassifications			5.5	(0.5)
Amount reclassified from accumulated other comprehensive loss,net of tax			4.2	3.7
Balance at end of period	(180.6)	(153.0)	(180.6)	(153.0)
Total Changes in Accumulated Other Comprehensive Loss, Net of Tax [Abstract]
Balance at beginning of period			(636.7)	(411.2)
Other comprehensive (loss) income before reclassifications			(102.6)	24.5
Amount reclassified from accumulated other comprehensive loss, net of tax	1.9	2.0	3.5	3.6
Balance at end of period	$ (735.8)	$ (383.1)	$ (735.8)	$ (383.1)