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Pension and Non-pension Post-employment Benefit Plans - Market Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Employee Benefits [Abstract] |  |
Debt investment funds | $ 225.2 | $ 283.1
Equity investment funds | 7.0 | 60.4
Other investment funds / insurance annuities | 148.5 | 25.6
Other | 14.8 | 8.1
Total | $ 395.5 | $ 377.2
Debt investment funds, allocation percentage | 57.00% | 75.00%
Equity investment funds, allocation percentage | 2.00% | 16.00%
Other investment funds / insurance annuities, allocation percentage | 37.00% | 7.00%
Other, allocation percentage | 4.00% | 2.00%
Total, allocation percentage | 100.00% | 100.00%

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