Debt - Components of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt payable—unconsolidated affiliate	$ 36.4	$ 33.4
Deferred payment obligation	29.5	29.1
Total debt	1,589.0	2,172.8
Debt payable within one year	80.2	58.8
Debt payable after one year	$ 1,508.8	$ 2,114.0
Weighted average interest rates on total debt	4.60%	4.10%
5.125% Senior Notes, Due 2021
Debt Instrument [Line Items]
Interest rate (percent)	5.125%	5.125%
Unamortized discount and debt issuance costs	$ 8.2	$ 8.9
Total debt	691.8	691.1
Term Loan B (USD)
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	6.6	15.6
Total debt	$ 401.8	$ 919.3
5.625% Senior Notes, Due 2024
Debt Instrument [Line Items]
Interest rate (percent)	5.625%	5.625%
Unamortized discount and debt issuance costs	$ 4.2	$ 4.5
Total debt	295.8	295.5
Term Loan B (EUR)
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	1.4	3.4
Total debt	87.5	158.7
Other borrowings
Debt Instrument [Line Items]
Total debt	$ 46.2	$ 45.7