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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Statements of Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Net earnings (loss) $ (100.4) $ 22.2 $ 17.7 $ (42.7) $ (176.5) $ 8.4 $ (60.5) $ (210.8)
Unrealized foreign currency translation adjustment, net of tax (5.7)     34.4     (101.6) 109.3
Realized loss on foreign currency transactions, net of tax             1.0  
Pension and other benefit adjustments:                
Net loss arising during the period, net of tax 0.1           (1.3)  
Amortization of net (gain) loss reclassified into general and administrative: other, net of tax               (0.5)
Amortization of net gain reclassified into general and administrative: other, net of tax               (0.5)
Marketable securities:                
Unrealized holding gains arising during the period, net of tax       0.2       0.5
Realized net (gain) loss reclassified into investment income, net of tax               (0.1)
Equity method investees' cash flow hedge:                
Unrealized holding gains arising during the period       0.1     0.2  
Realized net loss (gain) reclassified into equity in earnings of non-consolidated entities, net of tax (1.9)     (1.0)     (2.2) (0.9)
Other comprehensive income (loss), net of tax (7.5) $ (107.0) $ 10.5 33.7 $ 76.5 $ (1.9) (103.9) 108.3
Total comprehensive income (loss) (107.9)     (9.0)     (164.4) (102.5)
Consolidating Adjustments                
Net earnings (loss) 32.1     59.8     (31.9) 218.8
Equity in other comprehensive income (loss) of subsidiaries 13.3     (68.3)     179.3 (217.3)
Equity method investees' cash flow hedge:                
Other comprehensive income (loss), net of tax 13.3     (68.3)     179.3 (217.3)
Total comprehensive income (loss) 45.4     (8.5)     147.4 1.5
AMCE                
Net earnings (loss) (100.4)     (42.7)     (60.5) (210.8)
Equity in other comprehensive income (loss) of subsidiaries (8.0)     33.7     (103.9) 108.3
Equity method investees' cash flow hedge:                
Other comprehensive income (loss), net of tax (8.0)     33.7     (103.9) 108.3
Total comprehensive income (loss) (108.4)     (9.0)     (164.4) (102.5)
Subsidiary Guarantors                
Net earnings (loss) (42.5)     (38.9)     5.3 (199.8)
Equity in other comprehensive income (loss) of subsidiaries (5.3)     34.6     (75.4) 109.0
Unrealized foreign currency translation adjustment, net of tax (0.2)     (0.2)     (27.5) (0.2)
Realized loss on foreign currency transactions, net of tax             1.0  
Marketable securities:                
Unrealized holding gains arising during the period, net of tax       0.2       0.5
Realized net (gain) loss reclassified into investment income, net of tax               (0.1)
Equity method investees' cash flow hedge:                
Unrealized holding gains arising during the period       0.1     0.2  
Realized net loss (gain) reclassified into equity in earnings of non-consolidated entities, net of tax (1.9)     (1.0)     (2.2) (0.9)
Other comprehensive income (loss), net of tax (7.4)     33.7     (103.9) 108.3
Total comprehensive income (loss) (49.9)     (5.2)     (98.6) (91.5)
Subsidiary Non-Guarantors                
Net earnings (loss) 10.4     (20.9)     26.6 (19.0)
Unrealized foreign currency translation adjustment, net of tax (5.5)     34.6     (74.1) 109.5
Pension and other benefit adjustments:                
Net loss arising during the period, net of tax 0.1           (1.3)  
Amortization of net (gain) loss reclassified into general and administrative: other, net of tax               (0.5)
Equity method investees' cash flow hedge:                
Other comprehensive income (loss), net of tax (5.4)     34.6     (75.4) 109.0
Total comprehensive income (loss) $ 5.0     $ 13.7     $ (48.8) $ 90.0