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Stockholders' Equity (Changes in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance $ 2,837.2 $ 2,883.3 $ 3,496.9
Net losses reclassified from accumulated other comprehensive loss 14.6 10.7  
Other comprehensive income (loss), net of reclassification adjustments 81.2 20.2 (555.8)
Ending balance 3,095.3 2,837.2 2,883.3
Defined Benefit Pension Plans      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (304.5) (249.0)  
Other comprehensive income before reclassifications 6.8 (65.2)  
Net losses reclassified from accumulated other comprehensive loss 12.6 9.7  
Other comprehensive income (loss), net of reclassification adjustments 19.4 (55.5) 4.3
Ending balance (285.1) (304.5) (249.0)
Cumulative Translation Adjustment      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (1,128.4) (1,209.2)  
Other comprehensive income before reclassifications 56.6 80.8  
Net losses reclassified from accumulated other comprehensive loss 0.0 0.0  
Other comprehensive income (loss), net of reclassification adjustments 56.6 80.8 (556.1)
Ending balance (1,071.8) (1,128.4) (1,209.2)
Deferred Net Gains (Losses) on Derivatives      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (8.7) (2.0) (0.1)
Other comprehensive income before reclassifications 2.0 (7.7) (4.6)
Net losses reclassified from accumulated other comprehensive loss 2.0 1.0 2.7
Other comprehensive income (loss), net of reclassification adjustments 4.0 (6.7) (1.9)
Ending balance (4.7) (8.7) (2.0)
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (1,441.6) (1,460.2)  
Other comprehensive income before reclassifications 65.4 7.9  
Net losses reclassified from accumulated other comprehensive loss 14.6 10.7  
Other comprehensive income (loss), net of reclassification adjustments 80.0 18.6 (553.7)
Ending balance $ (1,361.6) $ (1,441.6) $ (1,460.2)