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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), net of tax beginning balance $ (224.0) $ (59.5) $ (27.7)
Other comprehensive income (loss), before reclassifications (92.5) 6.5 (19.1)
Amounts reclassified from accumulated other comprehensive income (loss) (3.4) (171.0) (12.7)
Net current period other comprehensive income (loss) (95.9) (164.5) (31.8)
Accumulated other comprehensive income (loss), net of tax ending balance (319.9) (224.0) (59.5)
Unrealized Gains (Losses) on Securities Available for Sale      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), net of tax beginning balance (0.8) (0.4) 5.6
Other comprehensive income (loss), before reclassifications (10.6) (1.7) 0.4
Amounts reclassified from accumulated other comprehensive income (loss) 0.6 1.3 (6.4)
Net current period other comprehensive income (loss) (10.0) (0.4) (6.0)
Accumulated other comprehensive income (loss), net of tax ending balance (10.8) (0.8) (0.4)
Unrealized Gains (Losses) on Cash Flow Hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), net of tax beginning balance 10.2 71.7 (23.7)
Other comprehensive income (loss), before reclassifications 51.6 110.8 101.7
Amounts reclassified from accumulated other comprehensive income (loss) (4.0) (172.3) (6.3)
Net current period other comprehensive income (loss) 47.6 (61.5) 95.4
Accumulated other comprehensive income (loss), net of tax ending balance 57.8 10.2 71.7
Unfunded Status of Postretirement Benefit Plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), net of tax beginning balance (37.8) (31.6) (19.6)
Other comprehensive income (loss), before reclassifications 5.1 (6.2) (12.0)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0 0.0
Net current period other comprehensive income (loss) 5.1 (6.2) (12.0)
Accumulated other comprehensive income (loss), net of tax ending balance (32.7) (37.8) (31.6)
Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss), net of tax beginning balance (195.6) (99.2) 10.0
Other comprehensive income (loss), before reclassifications (138.6) (96.4) (109.2)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0 0.0
Net current period other comprehensive income (loss) (138.6) (96.4) (109.2)
Accumulated other comprehensive income (loss), net of tax ending balance $ (334.2) $ (195.6) $ (99.2)