Fair Value Measurements and Risk - Carrying Amounts and Fair Values of Debt (Details) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		$ 1,555.7	$ 1,584.1
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		1,555.7	1,584.1
Other borrowings		78.5	110.2
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		1,608.8	1,633.2
Other borrowings		78.5	110.2
Term Loan B (USD)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs		5.3	5.7
Term Loan B (USD) | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	[1]	403.1	402.7
Term Loan B (USD) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		402.5	408.2
Term Loan B (EUR)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs		1.2	1.3
Term Loan B (EUR) | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	[1]	84.9	82.5
Term Loan B (EUR) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		85.2	82.0
5.125% Senior Notes, Due 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs		7.0	7.3
Total debt		$ 693.0	$ 692.7
Interest rate (percent)		5.125%	5.125%
5.125% Senior Notes, Due 2021 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	[2]	$ 693.0	$ 692.7
5.125% Senior Notes, Due 2021 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		729.4	721.3
5.625% Senior Notes, Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs		3.8	4.0
Total debt		$ 296.2	$ 296.0
Interest rate (percent)		5.625%	5.625%
5.625% Senior Notes, Due 2024 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	[2]	$ 296.2	$ 296.0
5.625% Senior Notes, Due 2024 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		$ 313.2	$ 311.5

[1] (2)Carrying amounts are net of unamortized debt issuance costs and discounts of $5.3 million and $1.2 million as of March 31, 2017, and $5.7 million and $1.3 million as of December 31, 2016, related to the U.S. dollar term loan and euro term loan, respectively.

[2] (1)Carrying amounts are net of unamortized debt issuance costs of $7.0 million and $3.8 million as of March 31, 2017, and $7.3 million and $4.0 million as of December 31, 2016, related to the 5.125% senior notes due 2021 and 5.625% senior notes due 2024, respectively.