Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014
Beginning Balance	$ (247.2)		$ (37.3)		$ (190.5)		$ (54.3)
Other comprehensive (loss) income before reclassifications (1)	(70.5)		(49.9)		(129.3)		(33.3)
Amounts reclassified from AOCI	1.0		0.4		3.1		0.8
Investment income	5.9		7.9		20.6		26.6
Net current-period other comprehensive (loss) income	(69.5)		(49.5)		(126.2)		(32.5)
Balance at September 30, 2015	(316.7)		(86.8)		(316.7)		(86.8)
Translation adjustment [Member]
Beginning Balance	(137.3)		19.0		(74.9)		(2.4)
Other comprehensive (loss) income before reclassifications (1)	(74.7)	[1]	(52.8)	[2]	(137.1)	[3]	(31.4)	[4]
Amounts reclassified from AOCI	0.0		0.0		0.0		0.0
Net current-period other comprehensive (loss) income	(74.7)		(52.8)		(137.1)		(31.4)
Balance at September 30, 2015	(212.0)		(33.8)		(212.0)		(33.8)
Foreign Currency Hedges
Beginning Balance	1.9		(5.5)		(1.4)		(1.9)
Other comprehensive (loss) income before reclassifications (1)	4.0		2.5		7.3		(1.1)
Amounts reclassified from AOCI	0.0		0.0		0.0		0.0
Net current-period other comprehensive (loss) income	4.0		2.5		7.3		(1.1)
Balance at September 30, 2015	5.9		(3.0)		5.9		(3.0)
Interest Rate Hedges
Beginning Balance	(0.3)		(0.8)		(0.5)		(1.0)
Other comprehensive (loss) income before reclassifications (1)	0.2		0.3		0.5		0.6
Amounts reclassified from AOCI	(0.1)		(0.1)		(0.2)		(0.2)
Net current-period other comprehensive (loss) income	0.1		0.2		0.3		0.4
Balance at September 30, 2015	(0.2)		(0.6)		(0.2)		(0.6)
Pension and Other Post-retirement Benefits
Beginning Balance	(111.8)		(51.1)		(114.0)		(52.0)
Other comprehensive (loss) income before reclassifications (1)	0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	1.1		0.5		3.3		1.4
Net current-period other comprehensive (loss) income	1.1		0.5		3.3		1.4
Balance at September 30, 2015	(110.7)		(50.6)		(110.7)		(50.6)
Unrealized Gain on Securities, Net
Beginning Balance			0.8				2.7
Other comprehensive (loss) income before reclassifications (1)			0.1				(1.4)
Investment income			0.0				(0.4)
Net current-period other comprehensive (loss) income			0.1				(1.8)
Balance at September 30, 2015			0.9				0.9
Other
Beginning Balance	0.3		0.3		0.3		0.3
Other comprehensive (loss) income before reclassifications (1)	0.0		0.0		0.0		0.0
Amounts reclassified from AOCI	0.0		0.0		0.0		0.0
Net current-period other comprehensive (loss) income	0.0		0.0		0.0		0.0
Balance at September 30, 2015	0.3		0.3		0.3		0.3
Translation adjustment [Member]
Other comprehensive (loss) income, translation adjustment, net of tax, attributable to noncontrolling interests	$ (0.6)		$ 0.2		$ (0.3)		$ (0.4)

[1] Other comprehensive (loss) income before reclassifications within the translation component excludes $(0.6) of translation attributable to noncontrolling interests.

[2] Other comprehensive (loss) income before reclassifications within the translation component excludes $0.2 of translation attributable to noncontrolling interests.

[3] Other comprehensive (loss) income before reclassifications within the translation component excludes $(0.3) of translation attributable to noncontrolling interests.

[4] Other comprehensive (loss) income before reclassifications within the translation component excludes $(0.4) of translation attributable to noncontrolling interests.