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Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
12 Months Ended
Jul. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance   $ (245.4) $ (202.9) $ (92.2)
Amounts reclassified from accumulated other comprehensive loss   3.2 4.4 (63.7)
Other comprehensive loss   (22.5) (28.5) (47.3)
Ending Balance   (370.3) (245.4) (202.9)
ASU 2018-02        
Accumulated Other Comprehensive Income Loss [Line Items]        
Impact of adopting ASU 2018-02 $ 22.0      
Changes in Fair Value of Derivatives        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive (loss) income before reclassifications   1.1    
Amounts reclassified from accumulated other comprehensive loss   (0.1)    
Other comprehensive loss   1.0    
Ending Balance   1.0    
Changes in the Fair Value of Available-for-Sale Securities        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance       119.3
Other comprehensive (loss) income before reclassifications       (48.5)
Amounts reclassified from accumulated other comprehensive loss       (70.8)
Other comprehensive loss       (119.3)
Pension and OPEB Plan Cost        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance   (155.2) (144.6) (159.5)
Other comprehensive (loss) income before reclassifications   (29.7) 6.4 10.6
Amounts reclassified from accumulated other comprehensive loss   (0.8) 4.4 4.3
Impact of adopting ASU 2018-02     (22.0)  
Other     0.6  
Other comprehensive loss   (30.5) 11.4 14.9
Ending Balance   (185.7) (155.2) (144.6)
Pension and OPEB Plan Cost | ASU 2018-02        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive loss     (10.6)  
Translation Adjustments        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance   1.4 40.9 (15.5)
Other comprehensive (loss) income before reclassifications   3.0 (39.5) 53.6
Amounts reclassified from accumulated other comprehensive loss   4.1   2.8
Other comprehensive loss   7.1   56.4
Ending Balance   8.5 1.4 40.9
Translation Adjustments | ASU 2018-02        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive loss     (39.5)  
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance   (153.8) (103.7) (55.7)
Other comprehensive (loss) income before reclassifications   (25.6) (33.1) 15.7
Amounts reclassified from accumulated other comprehensive loss   3.2 4.4 (63.7)
Impact of adopting ASU 2018-02     (22.0)  
Other     0.6  
Other comprehensive loss   (22.4) (28.1) (48.0)
Ending Balance   $ (176.2) (153.8) $ (103.7)
Accumulated Other Comprehensive Loss | ASU 2018-02        
Accumulated Other Comprehensive Income Loss [Line Items]        
Other comprehensive loss     $ (50.1)