Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jul. 02, 2021	Dec. 31, 2020
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes due 2025	$ 421.4	$ 411.1
Long-term debt	893.2	907.7
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes due 2025	1,112.2	902.7
Long-term debt	893.2	907.7
Interest rate swap derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	5.1	8.3
Interest rate swap derivative contracts | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	5.1	8.3
Interest rate swap derivative contracts | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	5.1	8.3
Cross-currency swap derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	42.8	61.8
Cross-currency swap derivative contracts | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	42.8	61.8
Cross-currency swap derivative contracts | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	$ 42.8	$ 61.8