Fair Value Measurements and Risk - Carrying Amounts and Fair Values of Debt (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		$ 1,568.4		$ 1,568.4		$ 1,584.1
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		1,568.4		1,568.4		1,584.1
Other borrowings		81.4		81.4		110.2
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		1,658.8		1,658.8		1,633.2
Other borrowings		81.4		81.4		110.2
Term Loan B (USD)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs		4.7		4.7		5.7
Term Loan B (USD) | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	[1]	403.7		403.7		402.7
Term Loan B (USD) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		405.7		405.7		408.2
Term Loan B (EUR)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs		1.0		1.0		1.3
Term Loan B (EUR) | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	[1]	93.1		93.1		82.5
Term Loan B (EUR) | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		93.2		93.2		82.0
5.125% Senior Notes, Due 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs		6.2		6.2		7.3
Total debt		$ 693.8		$ 693.8		$ 692.7
Interest rate (percent)		5.125%		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]	$ 693.8		$ 693.8		$ 692.7
5.125% Senior Notes, Due 2021 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		752.8		752.8		721.3
5.625% Senior Notes, Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs		3.6		3.6		4.0
Total debt		$ 296.4		$ 296.4		$ 296.0
Interest rate (percent)		5.625%		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]	$ 296.4		$ 296.4		$ 296.0
5.625% Senior Notes, Due 2024 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt		325.7		325.7		$ 311.5
Net Investment Hedging
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 0.0	$ 0.0	$ 0.0	$ 0.0

[1] (2)Carrying amounts are net of unamortized debt issuance costs and discounts of $4.7 million and $1.0 million as of September 30, 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 $6.2 million and $3.6 million as of September 30, 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.