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Financial Statement Revisions - Statement of Shareholders' Equity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance $ 3,716.0      
Repurchases and retirements of common shares (723.9) $ (887.2) $ (284.2)  
Net income 593.1 409.0 276.7  
Ending balance 3,360.8 3,716.0    
Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 3,737.2      
Net income   419.8 279.5  
Ending balance   3,737.2    
Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance (21.2)      
Net income   (10.8) (2.8)  
Ending balance   (21.2)    
Common shares and paid-in surplus        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 810.7 978.2 1,034.7  
Repurchases and retirements of common shares (147.9) (192.4) (67.0)  
Ending balance   810.7 978.2 $ 1,034.7
Common shares and paid-in surplus | Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 810.7 978.2 1,034.7  
Ending balance   810.7 978.2 1,034.7
Common shares and paid-in surplus | Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 0.0 0.0 0.0  
Ending balance   0.0 0.0 0.0
Retained earnings        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 2,776.6 3,075.0 3,003.0 2,801.4
Repurchases and retirements of common shares (576.0) (694.8) (217.2) (97.4)
Net income 627.2 401.8 295.2 305.2
Dividends declared on common shares (4.6) (5.4) (6.0) (6.2)
Net other changes in AOCI   113.9 (34.6) 66.6
Ending balance   2,776.6 3,075.0 3,003.0
Retained earnings | Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 2,797.2 3,084.9 3,010.5 2,801.9
Repurchases and retirements of common shares   (694.8) (217.2) (97.4)
Net income   412.5 297.6 312.2
Dividends declared on common shares   (5.4) (6.0) (6.2)
Net other changes in AOCI   113.9 (34.6) 66.6
Ending balance   2,797.2 3,084.9 3,010.5
Retained earnings | Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance (20.6) (9.9) (7.5) (0.5)
Repurchases and retirements of common shares   0.0 0.0 0.0
Net income   (10.7) (2.4) (7.0)
Dividends declared on common shares   0.0 0.0 0.0
Net other changes in AOCI   0.0 0.0 0.0
Ending balance   (20.6) (9.9) (7.5)
AOCL, after-tax        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance (4.6) (149.9) (42.1) 52.6
Ending balance   (4.6) (149.9) (42.1)
AOCL, after-tax | Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance (4.6) (149.9) (49.5) 52.1
Net change in pension liability and other accumulated comprehensive items   31.4 (65.8) (168.2)
Ending balance   (4.6) (149.9) (49.5)
AOCL, after-tax | Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 0.0 0.0 7.4 0.5
Ending balance   0.0 0.0 7.4
Parent        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 3,582.7 3,903.3 3,995.6  
Repurchases and retirements of common shares (723.9) (887.2) (284.2)  
Net income 627.2 401.8 295.2  
Dividends declared on common shares (4.6) (5.4) (6.0)  
Ending balance   3,582.7 3,903.3 3,995.6
Parent | Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 3,603.3 3,913.2 3,995.7  
Ending balance   3,603.3 3,913.2 3,995.7
Parent | Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance (20.6) (9.9) (0.1)  
Ending balance   (20.6) (9.9) (0.1)
Non-controlling interests        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 133.3 454.3 542.6 491.7
Repurchases and retirements of common shares (5.2)      
Net income (34.1) 7.2 (18.5) (22.3)
Other changes in NCI   (328.2) (69.8) 73.2
Ending balance   133.3 454.3 542.6
Non-controlling interests | Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 133.9 454.8 542.7 491.7
Net income   7.3 (18.1) (22.2)
Other changes in NCI   (328.2) (69.8) 73.2
Ending balance   133.9 454.8 542.7
Non-controlling interests | Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance (0.6) (0.5) (0.1) 0.0
Net income   (0.1) (0.4) (0.1)
Other changes in NCI   0.0 0.0 0.0
Ending balance   (0.6) (0.5) (0.1)
Total equity        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 3,716.0 4,357.6 4,538.2  
Repurchases and retirements of common shares (729.1) (887.2) (284.2)  
Net income 593.1 409.0 276.7  
Dividends declared on common shares (4.6) (5.4) (6.0)  
Ending balance   3,716.0 4,357.6 4,538.2
Total equity | Previously Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance 3,737.2 4,368.0 4,538.4  
Ending balance   3,737.2 4,368.0 4,538.4
Total equity | Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Beginning balance (21.2) (10.4) (0.2)  
Ending balance   (21.2) (10.4) (0.2)
Foreign Currency Gain (Loss) | AOCL, after-tax        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net change in pension liability and other accumulated comprehensive items 0.4 31.4 (73.2) (161.3)
Foreign Currency Gain (Loss) | AOCL, after-tax | Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net change in pension liability and other accumulated comprehensive items   0.0 (7.4) $ 6.9
Foreign Currency Gain (Loss) | Parent        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net change in pension liability and other accumulated comprehensive items 0.4 31.4 (73.2)  
Foreign Currency Gain (Loss) | Non-controlling interests        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net change in pension liability and other accumulated comprehensive items 0.1 0.3    
Foreign Currency Gain (Loss) | Total equity        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net change in pension liability and other accumulated comprehensive items $ 0.5 $ 31.7 $ (73.2)