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Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 01, 2018
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]                  
Beginning Balance $ (247.5) $ (270.8) $ (250.0) $ (245.4) $ (247.5) $ (188.3) $ (202.9) $ (245.4) $ (202.9)
Amounts reclassified from accumulated other comprehensive (loss) income   (0.2)     1.0     (5.1) 4.1
Other   0.6     0.0     2.1 0.0
Other comprehensive loss   (19.5) (2.5) 1.6 (6.8) (39.9) 21.5 (20.4) (25.2)
Ending Balance   (276.9) $ (270.8) (250.0) (219.5) $ (247.5) (188.3) (276.9) (219.5)
ASU 2018-02                  
Accumulated Other Comprehensive Income Loss [Line Items]                  
Impact of adopting ASU 2018-02 $ 22.0                
Pension and OPEB Cost                  
Accumulated Other Comprehensive Income Loss [Line Items]                  
Beginning Balance       (155.2)     (144.6) (155.2) (144.6)
Other comprehensive (loss) income before reclassifications                 1.2
Amounts reclassified from accumulated other comprehensive (loss) income               (0.6) 4.1
Impact of adopting ASU 2018-02                 (22.1)
Other                 0.6
Other comprehensive loss   (0.2)     1.6     (0.6) 5.9
Ending Balance   (155.8)     (160.8)     (155.8) (160.8)
Pension and OPEB Cost | ASU 2018-02                  
Accumulated Other Comprehensive Income Loss [Line Items]                  
Other comprehensive loss                 (16.2)
Translation Adjustments                  
Accumulated Other Comprehensive Income Loss [Line Items]                  
Beginning Balance       1.4     40.9 1.4 40.9
Other comprehensive (loss) income before reclassifications               (17.1) (30.6)
Amounts reclassified from accumulated other comprehensive (loss) income               (4.5)  
Other comprehensive loss               (21.6)  
Ending Balance   (20.2)     10.3     (20.2) 10.3
Translation Adjustments | ASU 2018-02                  
Accumulated Other Comprehensive Income Loss [Line Items]                  
Other comprehensive loss                 (30.6)
Other                  
Accumulated Other Comprehensive Income Loss [Line Items]                  
Other comprehensive (loss) income before reclassifications               2.1  
Other comprehensive loss   0.6           2.1  
Ending Balance   2.1           2.1  
AOCI Attributable to Parent                  
Accumulated Other Comprehensive Income Loss [Line Items]                  
Beginning Balance       $ (153.8)     $ (103.7) (153.8) (103.7)
Other comprehensive (loss) income before reclassifications               (15.0) (29.4)
Amounts reclassified from accumulated other comprehensive (loss) income               (5.1) 4.1
Impact of adopting ASU 2018-02                 (22.1)
Other                 0.6
Other comprehensive loss               (20.1)  
Ending Balance   $ (173.9)     $ (150.5)     $ (173.9) (150.5)
AOCI Attributable to Parent | ASU 2018-02                  
Accumulated Other Comprehensive Income Loss [Line Items]                  
Other comprehensive loss                 $ (46.8)