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Retirement Benefits - Retirement Cost (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
participant
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost on projected benefit obligation 37.1 36.0 45.3
Return on assets – expected (54.6) (54.6) (63.9)
Amortization of losses 24.9 31.2 28.2
Amortization of prior service cost 0.0 0.0 0.0
Settlement loss 0.0 0.0 56.1
Net periodic pension cost 7.4 12.6 $ 65.7
Number of participants | participant     4,300
U.S. Plans | Continuing operations      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost 7.4 12.6 $ 65.7
U.S. Plans | Discontinued operations      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost 0.0 0.0 0.0
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 10.5 10.4 12.5
Interest cost on projected benefit obligation 11.5 11.2 18.4
Return on assets – expected (9.5) (9.5) (14.4)
Amortization of losses 5.1 5.0 2.3
Amortization of prior service cost 1.0 0.9 1.0
Settlement loss 3.1 5.7 6.3
Net periodic pension cost 21.7 23.7 26.1
Non-U.S. Plans | Continuing operations      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost 21.7 22.6 24.4
Non-U.S. Plans | Discontinued operations      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost 0.0 1.1 1.7
Total      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 10.5 10.4 12.5
Interest cost on projected benefit obligation 48.6 47.2 63.7
Return on assets – expected (64.1) (64.1) (78.3)
Amortization of losses 30.0 36.2 30.5
Amortization of prior service cost 1.0 0.9 1.0
Settlement loss 3.1 5.7 62.4
Net periodic pension cost 29.1 36.3 91.8
Total | Continuing operations      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost 29.1 35.2 90.1
Total | Discontinued operations      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic pension cost 0.0 1.1 1.7
UMWA Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost on projected benefit obligation 18.9 17.1 17.9
Return on assets – expected (17.5) (20.6) (22.2)
Amortization of losses 18.0 15.5 12.3
Amortization of prior service cost (4.6) (4.6) (4.6)
Curtailment (gain) 0.0 0.0 0.0
Net periodic pension cost 14.8 7.4 3.4
Black Lung and Other Plans, Medical      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.2 0.1
Interest cost on projected benefit obligation 2.7 2.8 2.3
Return on assets – expected 0.0 0.0 0.0
Amortization of losses 2.5 3.1 0.6
Amortization of prior service cost 1.7 1.8 1.7
Curtailment (gain) 0.0 (0.1) 0.0
Net periodic pension cost 6.9 7.8 4.7
Retirement benefits other than pension      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.2 0.1
Interest cost on projected benefit obligation 21.6 19.9 20.2
Return on assets – expected (17.5) (20.6) (22.2)
Amortization of losses 20.5 18.6 12.9
Amortization of prior service cost (2.9) (2.8) (2.9)
Curtailment (gain) 0.0 (0.1) 0.0
Net periodic pension cost $ 21.7 $ 15.2 $ 8.1