Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period			$ 1,790.2
Balance at the end of the period	$ 1,695.8		1,695.8
Foreign Currency Translation
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(114.6)	$ (103.9)	(113.5)	$ (51.7)
Other comprehensive income (loss) before reclassifications	(55.5)	38.0	(56.6)	(14.2)
Net current period other comprehensive income (loss)	(55.5)	38.0	(56.6)	(14.2)
Balance at the end of the period	(170.1)	(65.9)	(170.1)	(65.9)
Other
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(8.1)	(3.9)	(9.0)	(1.6)
Other comprehensive income (loss) before reclassifications	0.6	0.5	1.5	(1.8)
Net current period other comprehensive income (loss)	0.6	0.5	1.5	(1.8)
Balance at the end of the period	(7.5)	(3.4)	(7.5)	(3.4)
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(122.7)	(107.8)	(122.5)	(53.3)
Other comprehensive income (loss) before reclassifications	(54.9)	38.5	(55.1)	(16.0)
Net current period other comprehensive income (loss)	(54.9)	38.5	(55.1)	(16.0)
Balance at the end of the period	$ (177.6)	$ (69.3)	$ (177.6)	$ (69.3)