Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax beginning balance	$ (59.5)	$ (27.7)	$ (55.3)
Other comprehensive income (loss), before reclassifications	6.5	(19.1)	24.3
Amounts reclassified from accumulated other comprehensive income (loss)	(171.0)	(12.7)	3.3
Net current period other comprehensive income (loss)	(164.5)	31.8	27.6
Accumulated other comprehensive income (loss), net of tax ending balance	(224.0)	(59.5)	(27.7)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax beginning balance	(0.4)	5.6	4.2
Other comprehensive income (loss), before reclassifications	(1.7)	0.4	11.8
Amounts reclassified from accumulated other comprehensive income (loss)	1.3	(6.4)	(10.4)
Net current period other comprehensive income (loss)	0.4	6.0	(1.4)
Accumulated other comprehensive income (loss), net of tax ending balance	(0.8)	(0.4)	5.6
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax beginning balance	71.7	(23.7)	(10.7)
Other comprehensive income (loss), before reclassifications	110.8	101.7	(26.7)
Amounts reclassified from accumulated other comprehensive income (loss)	(172.3)	(6.3)	13.7
Net current period other comprehensive income (loss)	61.5	(95.4)	13.0
Accumulated other comprehensive income (loss), net of tax ending balance	10.2	71.7	(23.7)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax beginning balance	(31.6)	(19.6)	(21.7)
Other comprehensive income (loss), before reclassifications	(6.2)	(12.0)	2.1
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0
Net current period other comprehensive income (loss)	6.2	12.0	(2.1)
Accumulated other comprehensive income (loss), net of tax ending balance	(37.8)	(31.6)	(19.6)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax beginning balance	(99.2)	10.0	(27.1)
Other comprehensive income (loss), before reclassifications	(96.4)	(109.2)	37.1
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0
Net current period other comprehensive income (loss)	96.4	109.2	(37.1)
Accumulated other comprehensive income (loss), net of tax ending balance	$ (195.6)	$ (99.2)	$ 10.0